The interesting points of view which the study of racial geography presents are numberless. This is particularly shown in Professor Ripley's chapter on Modern Social Problems. In this chapter the writer acknowledges, as he does elsewhere, that theories of race and of heredity have sometimes been pushed too far. He demands a due recognition of the influence of environment, and cites cases where environment will explain divergences from what are recognized as race characteristics or tendencies. An example of this is afforded by the case of Brittany, in connection with separateness of home life. The population of Brittany belongs to a race that is particularly prone to such separateness, and yet in Brittany there is an unusual intermingling of families under one roof. We can not enter into the explanation here, but Professor Ripley shows how the physical geography of the country may account for the variation from type. In the same chapter the writer shows very interestingly how the Celtic parts of France manifest almost invariably conservative tendencies: how they shun divorce, afford a very low rate of suicide, and, in the matter of crime, tend rather to deeds of violence than to acts of dishonesty. The general impression which the intelligent reader will gather from the whole work is that "racial geography" has all the interest of a rapidly growing science; but that, while much has been accomplished, much more remains to be done. The lines of research are many, and we may reasonably hope that before long the combined labors of anthropologist, ethnologist, and sociologist will give us a coherent body of knowledge and theory which shall not only illuminate the past but be of the very highest value for the comprehension of the problems of our own day. Scientific Literature. SPECIAL BOOKS. In a study of what constitutes the foundations of zoölogy we know of no one better equipped to discuss the various problems than Professor Brooks.[V] As an original investigator in many groups of invertebrate zoölogy, as a student of animal life in temperate and tropical seas, as a special teacher of embryology and zoölogy for a quarter of a century, and, above all, as a profound student of the philosophical literature of the subject, his equipment is thorough and complete. A fair review of this work would be difficult without voluminous quotations from its pages. [Footnote V: The Foundations of Zoölogy. A Course of Lectures delivered at Columbia University on the Principles of Science as illustrated by Zoölogy. By William Keith Brooks, Ph. D., LL. D., Professor of Zoölogy at Johns Hopkins University. Pp. 339. The Macmillan Company.]